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<h2>IupHelp</h2>
<p>Opens the given URL. In UNIX executes 
  Netscape, Safari (MacOS) or Firefox (in Linux) passing the desired URL as a parameter. In Windows 
executes the shell &quot;open&quot; operation on the given URL.</p>
<p>In UNIX you can change the used browser setting the environment variable IUP_HELPAPP or using the global attribute 
  &quot;HELPAPP&quot;.</p>
<p>It is a non synchronous operation, i.e. the function will return just after 
execute the command and it will not wait for its result.</p>
<h3>
Parameters/Return</h3>
<pre>int IupHelp(const char* <strong>url</strong>); [in C]
iup.Help(<strong>url</strong>: string) [in Lua]</pre>
<p><strong>url</strong>:
  may be any kind of address accepted by the 
  Browser, that is, it can include 'http://', or be just a file name, etc.</p>
<p><span class="style1">Returns:</span> 1 if successfull, -1 if failed. In Windows can return -2 if file not found.</p>

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